All calorie calculations are estimates, and most methods have at least some limitations.
Many pieces of gym equipment (including treadmills) are notorious for significantly overestimating the calories burned.
But walking is generally a well-studied and understood exercise, and online calculators are generally a reasonable estimate for this activity. However, they can be misleading for other activities where the intensity of effort is harder to judge objectively.
High blood pressure and some medications can lead to a faster heart rate than the exercise itself warrants, and this can lead to HRM's significantly overestimating the calories burned.
Unless you are using incline on the treadmill, I would go with the more conservative of the estimates.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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